30 ILCS 500/1-15.20
"Construction" means building, altering, repairing, improving, or demolishing any public structure or building, or making improvements of any kind to public real property. Construction does not include the routine operation, routine repair, or routine maintenance of existing structures, buildings, or real property.
"Construction-related services" means those services including construction design, layout, inspection, support, feasibility or location study, research, development, planning, or other investigative study undertaken by a construction agency concerning construction or potential construction.
"Construction support" means all equipment, supplies, and services that are necessary to the operation of a construction agency's construction program. "Construction support" does not include construction-related services.
30 ILCS 500/1-15.20